|BN_CTX_NEW(3)||Library Functions Manual||BN_CTX_NEW(3)|
— allocate and free BN_CTX structures
A BN_CTX is a structure that holds BIGNUM temporary variables used by library functions. Since dynamic memory allocation to create BIGNUMs is rather expensive when used in conjunction with repeated subroutine calls, the BN_CTX structure is used.
BN_CTX_new() allocates and initializes a
BN_CTX_free() frees the components of the
BN_CTX and, if it was created by
BN_CTX_new(), also the structure itself. If
BN_CTX_start(3) has been used on
BN_CTX_end(3) must be called before
the BN_CTX may be freed by
BN_CTX_free(). If c is a
NULL pointer, no action occurs.
BN_CTX_init() (deprecated) initializes an
existing uninitialized BN_CTX. This should not be used
for new programs. Use
BN_CTX_new() returns a pointer to the
BN_CTX. If the allocation fails, it returns
NULL and sets an error code that can be obtained by
BN_CTX_free() first appeared in SSLeay 0.5.1 and
have been available since OpenBSD 2.4.
BN_CTX_init() first appeared in SSLeay
0.9.1 and has been available since OpenBSD 2.6.
|June 10, 2019||OpenBSD-current|